Procrastinator

Helps you stay focused on the web by blocking unnecessary destractions

** new - you can now customise the block page with your own url; either local file, or http url!
Find yourself getting easily distracted while completing tasks on the web? Procrastinator allows you to block websites you consider distracting to ensure you stay focused on your task.
Procrastinator is designed to quickly add the websites you deem a distraction, and it does the rest. You also control when the websites are blocked with a simple timespan.
This chrome extension will allow you to stay focused, and block yourself from distractions whilst you work.
Procrastinator gives you the control of which specific websites, or a sub-set of websites using it's simple pattern matching techniques. Or if you're a power user, you can use regular expressions to fine tune which url's are blocked.
Once you have defined your list of sites you want to block, you can also individually control the blocker for each website, or use a general time span to control all of the blocked websites.